Grinding-mill.



110.742,191. A PATENTE-001.27, 1903.

P. E. HODGKIN a; 11. PEMBERTON.

GRINDING MILL. APPLIOATION Hum 001.16. 1902.

2 SHEETS-HEBT 1,.

N0 MODEL.

ma Nonms PETERS co', Pnormumu., wAsHxNavo, n. c.

No. 742,191. y PATENTED 00T. 27, 190s. P. E. HODGKIN & R. PBMBBRTON.

AGRINDING MILL.

- ABPLIGATLON FILED v001216. 1902.

11o-MODEL. a SHEETS-SHEET z.

NITED STATES Patented October 27, 1903.

- PATENT OFFICE.

NORTIIFLEET, ENGLAND, ASSIGNORS TO THE PULSOMETER ENGINEER- j -ING COMPANY, LIMITED, OF READING, ENGLAND.

onmouse-MILL.

SPECIFICATION forming part of Letters Patent No. 742,191, dated October 27, 1903.

VApplication filed October 16, 1902,

T0 a/ZZ whom it may concern.'

Be it known that we, PHILIP ELIoT Hono- KIN, residing at Reading, in the county of Berks, and RICHARD PEMBERTON, residing at Northfieet, in the county of Kent, England, subjects of the King of Great Britain and Ireland, have invented Improvements in Grinding-Mills, of which the following is a specification.

This invention. has reference to grindingmills of the kind wherein a runner having an external conical surface is arranged to work within a fixed stone having an internal conical surface and which are speciallysuit able for grinding cement. In such mills the runner and xed stone have heretofore each been made in one piece, and as the conical grinding-surfaces revolve atdifferent speeds at different points along the periphery thereof in the direction of the axis and rapidly become unevenly worn costly repairs and renewals become necessary, which alsoinvolve much loss of time. Furthermore, such runners and Iixed stones are expensive in rst cost. Now according to the present invention in order to increase the life of the runner and fixed stone used in' such mills and to facilitate and cheapen the construction and renewal of these parts each of them instead of being made in onepiece as heretofore is built up of annular sections of varying diameters that are arranged side by side at right angles to the axis of the driving-shaft and are detachably secured in place, the arrangement being such that when any section has become unduly'worn it can be easily removed and replaced by another without necessarily renewing the whole of the sections and so 'that each section, except the smallest,` can when Worn be utilized after being turned down to a suitable size to take the place when necessary of the next smaller section. l

The invention also vconsists in various combinations and arrangements of parts, as hereinafter described, and pointed out in the claims.

In the accompanying illustrative drawings, Figure l shows, partly in longitudinal section Serial No. 127.557. (No model.)

on the line AA of Fig. 2 and partlyin side elevation, and' Fig. 2 in end elevation, a grinding-mill embodying the present invention.

a a. are the annular sections composing the` runner, secured upon the driving-shaft b, and c o are the annular sections composing the fixed stone, secured in the forward portion d of a stationary casing CZ e.

To enable the annular sections a of the runner to be readily` removed from the driving-shaft b, they are held in place endwise thereon by suitable clamping means, and that end portion of the shaft over which the sections are to be passed is made plain-that is to say, without any collar or circumferential projection that would interfere with the removal of the said` sections. The said end a bearing f, carried by a cross-beam g, that kis mounted to slide endwise upon the side portions hof the bed plate or lframe of the machine, but is normally fixed to said side portions, the arrangement being such that after removing the adjusting means used for forcing the shaft b endwise to keep the runner up to the xed stone and detaching the cross-beam g from the side portions h the said crossbeam g, with bearing f, can be slid endwise o the shaft and the rear end-portion e of the mill-casing removed, after which the annular sections a can be easily loosened and one or more of them removed and replaced by another or others, and after again clamping the sections in place the rear end portion e of the casing, the cross-beam g, with bearing f, and the adjusting means can be returned to andl fixed in their original position, the whole operation being easily effected in a comparatively `short time. When the rear end portion e of the casing and the sections a of the runner are removed, ready access is also afforded to the sections o of the fixed stone. v

In the constructional form of grinding-mill shown in the drawings each annular section a of the runner is fixed upon a metal ring fm of L-seotion, and the several rings m, with the sections o, are fixed in place upon the driving-shaft b between a collar or shoulder n on the forward portion thereof and a clampring 7a, that is forced forward by suitable means, such as a cotter o, passing through the shaft. The annular sections o of the fixed stone are secured, as by cement p, within the stationary forward portion d of the mill-casing, through which the driving-shaft i) extends. The said forward portion of the casing is formed with a feed-opening q, over which is secured the lower end of a feed-hopper T, so that the material to be ground can pass from a space s, into which it is directly fed, to the gradually -increasing annular space between the runner and fixed stone, the ground material being finally discharged into the rear portion c of the millcasing, which is provided with an outlet ii for the ground material and is deta-chably secured, as by bolts, to the stationary forward portion cl of the casing.

The forward end of the driving-shaft b is mounted in a bearing u on a cross-beam c, fixed to the side frames or bearings 7L, like the rear end portion of the driving-shaft b, which is plain-z'- e. ,without projection s-and is provided with a ball thrust-bearing w, arranged to be set up by an adjusting-screw x, carried by a xed bearing y and provided with a hand-wheel z.

The adjacent surfaces of the runner and fixed stone may be formed with a dressing consisting of any suitable arrangement of furrows. Also narrow annular spaces or openings l may advantageously be formed between the adjacent sections c of the fixed stone, such spaces or openings extending from the inner conical surface of the stone outward in planes at right angles to the axisV of the driving-shaft i) for the purpose of delaying the passage through the mill of the material being ground, thus giving a longer time during which the material will be subjected to the grinding action than if they were absent.

That we claim is- 1. A grinding-mill comprising a casing consisting of forward and rearward parts detachably con nected together and provided respectively with an inlet for material to be ground and an outlet for ground material, a fixed stone built up of a number of annular sections placed side by side and secured in the forward portion of said casing, adriving-shaft extending longitudinally through said casing and fixed stone and having a plain rear end, a conical runner having an external conical surface and a cylindrical bore and built up of a number of annular sections fixed side by side in a detachable manner to said shaft, longitudinal frames at the sides of said casing, forward and rearward cross-beams carried by said side frames and provided with bearings for said shaft, and means for forcing the said shaft and runner end wise.

2. A grinding-mill comprising a fixed stone having an external cylindrical surface and an internal conical surface, a ruimer having a corresponding external conical surface and a cylindrical bore and built up of a number of sections arranged side by side and each fixed at its center to a metal ring, a drivingshaft having a shoulder on its forward portion against. which the ring of the foremost section can bear and havingits rearward end shaped to admit of the runner-sections with rings being readily removed therefrom, a clampingring surrounding said shaft, means for forcing said clamping-ring against the rearmost runner-section and the foremost one against the shoulder on said shaft, means for supporting said shaft and means for forcing the same endwise, substantially as described.

3. A grinding-mill comprisinga casing having a feed-opening in its front end and a detachable rear portion with outlet-opening at its lower part, a fixed stone built up of annular sections arranged side by side and secured in the forward portion of said casing, said fixed stone having a conical inner surface that increases in area toward the rear and a cylindrical outer surface, a run-ner having a corresponding but reversely-arranged external conical surface arranged to work within said fixed stone, said runner having a cylindrical bore and being built up of annular sections arranged side by side and each fitted to a central metal ring, a longitudinal drivingshaft extending through said casing and runner and having a shoulder on its forward end against which the foremost section of the runner bears and a plain rear end, front and rear bearings for said shaft, the rear bearing being removable, a clamping-ring surrounding said shaft and arranged to bear against the rear surface of the real-most section of the runner, a Cotter extending through said shaft and adapted to set up said clampingring, and means for adjusting said shaft with runner endwise, substantially as described.

Signed at 75-77 Cornhill, London, England, this 22d day of September, 1902.

PHILIP ELIOT HODGKIN. RICHARD PEMBERTON. Vitnesses:

PERCY E. MAT'rocxs, WM. O. BROWN.

IIO 

